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Abstract <p>Zeolite ZSM-48 is an efficient acidic catalyst support for the hydroisomerization of higher (C<sub>16+</sub>) <i>n</i>-paraffins, but its industrial application is hindered by the high cost of conventional structure-directing agents (SDAs). This study develops a more economical synthesis method using hexamethylenediamine (HDA) as an affordable SDA. A series of high-crystallinity zeolite samples (SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> = 160–200) were synthesized hydrothermally. After loading with 0.5 wt % Pt, their physicochemical properties and catalytic performance were evaluated in the hydroisomerization of <i>n</i>-hexadecane at 3.0 MPa. The initial alkali content in the reaction gel was identified as a critical parameter controlling crystallization selectivity, crystal morphology, and crystallinity. The sample synthesized with low alkali content exhibited the highest performance, achieving 90% <i>n</i>-hexadecane conversion at 320°C with a yield of desired isomers up to 62%. This demonstrates the high potential of HDA for crystallizing selective ZSM-48 and for preparing promising catalysts for the hydroisomerization of higher <i>n</i>-paraffins.</p>

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Hydroisomerization of n-Hexadecane over Highly Dispersed ZSM-48 Synthesized Using Hexamethylenediamine

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • D. V. Serebrennikov,
  • A. R. Zabirov,
  • A. D. Zimina,
  • N. A. Filippova,
  • R. Z. Kuvatova,
  • D. Sh. Sabirov,
  • M. R. Agliullin

摘要

Abstract

Zeolite ZSM-48 is an efficient acidic catalyst support for the hydroisomerization of higher (C16+) n-paraffins, but its industrial application is hindered by the high cost of conventional structure-directing agents (SDAs). This study develops a more economical synthesis method using hexamethylenediamine (HDA) as an affordable SDA. A series of high-crystallinity zeolite samples (SiO2/Al2O3 = 160–200) were synthesized hydrothermally. After loading with 0.5 wt % Pt, their physicochemical properties and catalytic performance were evaluated in the hydroisomerization of n-hexadecane at 3.0 MPa. The initial alkali content in the reaction gel was identified as a critical parameter controlling crystallization selectivity, crystal morphology, and crystallinity. The sample synthesized with low alkali content exhibited the highest performance, achieving 90% n-hexadecane conversion at 320°C with a yield of desired isomers up to 62%. This demonstrates the high potential of HDA for crystallizing selective ZSM-48 and for preparing promising catalysts for the hydroisomerization of higher n-paraffins.